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Visual Basic - Error I Can't Fix

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#1 Tbenner019


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Posted 30 August 2007 - 04:28 PM

Hello everyone, I've been having trouble with an error I have no idea how to fix. The error is:

[codebox]System.InvalidOperationException was unhandled
Message="An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object."
at Practice1B.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 190
at Practice1B.My.MyProject.MyForms.get_Form1()
at Practice1B.My.MyApplication.OnCreateMainForm() in C:\Documents and Settings\User\Local Settings\Application Data\Temporary Projects\Practice1B\My Project\Application.Designer.vb:line 35
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at Practice1B.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

It seems, from my understanding, that there is an error in the automatically generated code on LINE 81. I can't understand how to fix this problem and any help would be much appriciated.

Edited by Tbenner019, 30 August 2007 - 04:30 PM.

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#2 groovicus


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Posted 30 August 2007 - 09:47 PM

The error message is simple enough.

Object reference not set to an instance of an object

Apparently you have not properly initialized a reference in line 190 of your code. Hard to say what is wrong without seeing the code though.

#3 TheDoctor


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Posted 12 September 2007 - 01:44 PM

I think the error is due to an attemp to modify the Auto-generated code of the form layout.
In Visual Basic .NET every forms create its own code for all the control in the form and the form layout too. These controls can be modified only with the integrated form editor. If someone tries to write his/her own form code from the "code editor" it will cause this kind of error.
You can try to remove the form that causes the error from your project, create a new one, remake the form controls and layout, then copy the source code from the old one to the new form and the problem should be fixed.

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